| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de>, Noah Misch <noah(at)leadboat(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Rework the way multixact truncations work |
| Date: | 2015-10-27 20:51:45 |
| Message-ID: | 562FE3E1.5070303@agliodbs.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On 10/27/2015 07:44 AM, Andres Freund wrote:
>> Unlinking old pg_clog files is strictly an optimization. If you were to
>> > comment out every unlink() call in slru.c, the only ill effect on CLOG is the
>> > waste of disk space. Is the same true of MultiXact?
> Well, multixacts are a lot larger than the other SLRUs, I think that
> makes some sort of difference.
And by "a lot larger" we're talking like 50X to 100X. I regularly see
pg_multixact directories larger than 1GB.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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